#range
for i in range(5): print(i,end=",")
print('---------------------')
for i in range(3, 6): print(i,end=",")
print('---------------------')
# isinstance 判断一个对象是否是一个已知的类型
print(isinstance("abc",str))
print(isinstance(123,str))
print(isinstance("123",(int,str)))